package ran.ding.springmvc.interceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

public class DemoInterceptor extends HandlerInterceptorAdapter{
	//请求操作发生前
	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
			throws Exception {
		long startTime=System.currentTimeMillis();
		request.setAttribute("startTime", startTime);
		return true;
	}
	//请求操作发生后
	@Override
	public void postHandle(
			HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView)
			throws Exception {
		long startTime=(long) request.getAttribute("startTime");
		request.removeAttribute("startTime");
		long endTime=System.currentTimeMillis();
		System.out.println("本次请求处理时间为："+new Long(endTime-startTime)+"ms");
		request.setAttribute("handlingTime", endTime-startTime);
	}
}
